Abstract: A compensating accelerometer includes a housing, and a sensing element mounted in the housing. The sensing element includes a pendulum flexibly mounted on a base. The sensing element includes a coil mounted on a movable plate, a curtain having a slit, and a load mass affixed to the curtain. An angle sensor within the housing includes the curtain, a fork, a light source and a differential light detector. A momentum sensor within the housing includes a permanent magnet, an inner magnetic conductor, an outer magnetic conductor and the coil. The permanent magnet is magnetized in a direction of an axis of the pendulum. A stopper is used to adjust position of the fork. A spring is on opposite side of the fork, for taking up slack in the fork. A fixator has an eccentric, for adjusting a gap between the curtain and the light detector.

Abstract: A servo compensating accelerometer includes a top housing half and a bottom housing half rigidly connected together, and each having coaxial threaded openings. A sensing element is positioned between the top and bottom halves and affixed to the bottom half. Top and bottom magnetic systems, each of which has a magnetic conductor, a permanent magnet and a field concentrator, the magnetic systems being mounted within the respective top and bottom halves of the housing using the threaded openings. A momentum sensor includes the top and bottom magnetic systems, and also includes two movable coils mounted on a plate and positioned within the magnetic systems. A differential angle sensor includes toroidal excitation coils located on the permanent magnets, the magnetic systems and the coils of the momentum sensor. Zero bias of the accelerometer's angular displacement sensor is tuned by adjusting the position of the magnetic systems by moving them in the threaded openings.

Abstract: A compensating accelerometer includes a housing, and a sensing element mounted in the housing. The sensing element includes a pendulum flexibly mounted on a base. The sensing element includes a coil mounted on a movable plate, a curtain having a slit, and a load mass affixed to the curtain. An angle sensor within the housing includes the curtain, a fork, a light source and a differential light detector. A momentum sensor within the housing includes a permanent magnet, an inner magnetic conductor, an outer magnetic conductor and the coil. The permanent magnet is magnetized in a direction of an axis of the pendulum. A stopper is used to adjust position of the fork. A spring is on opposite side of the fork, for taking up slack in the fork. A fixator has an eccentric, for adjusting a gap between the curtain and the light detector.

Abstract: A servo compensating accelerometer includes a top housing half and a bottom housing half rigidly connected together, and each having coaxial threaded openings. A sensing element is positioned between the top and bottom halves and affixed to the bottom half. Top and bottom magnetic systems, each of which has a magnetic conductor, a permanent magnet and a field concentrator, the magnetic systems being mounted within the respective top and bottom halves of the housing using the threaded openings. A momentum sensor includes the top and bottom magnetic systems, and also includes two movable coils mounted on a plate and positioned within the magnetic systems. A differential angle sensor includes toroidal excitation coils located on the permanent magnets, the magnetic systems and the coils of the momentum sensor. Zero bias of the accelerometer's angular displacement sensor is tuned by adjusting the position of the magnetic systems by moving them in the threaded openings.